WOLFRAM SYSTEM MODELER

OpenCenterHydraulicSystem

Example circuit with a pump that unloads to a reservoir when inactive

Diagram

Wolfram Language

In[1]:=
SystemModel["Hydraulic.Examples.Rotation.OpenCenterHydraulicSystem"]
Out[1]:=

Information

This example shows three motors that are driven by a pump. Each motor has a different load. The open center valves direct pump flow to a reservoir when no motors are running. This means that the pump will not have to run constantly at the relief valve setting.

Fig. 1 shows how the three control valves are opened and then closed one after another. Fig. 2 shows how the motors start to spin and then stop when the corresponding valve is opened and closed. Fig. 3 shows how the open center design succeeds in reducing pump torque when no motor is used.

openCenterHydraulicSystemPlot1
Fig. 1 Control valve opening states

openCenterHydraulicSystemPlot2
Fig. 2 Motor speeds

openCenterHydraulicSystemPlot3
Fig. 3 Pump torque

Parameters (1)

medium

Value: Oil()

Type: Medium

Description: Medium in the component

Components (36)

medium

Type: Medium

Description: Medium in the component

tank5

Type: Tank

tank6

Type: Tank

pump

Type: Pump

volume1

Type: Volume

constantSpeed

Type: ConstantSpeed

pressureReliefValve

Type: PressureReliefValve

controlValve2

Type: PCVE63

const2

Type: Constant

tank1

Type: Tank

const3

Type: Constant

controlValve3

Type: PCVE63

const1

Type: Constant

controlValve1

Type: PCVE63

volume2

Type: Volume

volume3

Type: Volume

tank2

Type: Tank

tank3

Type: Tank

tank4

Type: Tank

motor1

Type: Motor

inertia1

Type: Inertia

speedSensor1

Type: SpeedSensor

speedSensor2

Type: SpeedSensor

inertia2

Type: Inertia

motor2

Type: Motor

speedSensor3

Type: SpeedSensor

inertia3

Type: Inertia

motor3

Type: Motor

singlePulse1

Type: SinglePulse

gain1

Type: Gain

gain2

Type: Gain

singlePulse2

Type: SinglePulse

singlePulse3

Type: SinglePulse

gain3

Type: Gain

constantTorque3

Type: ConstantTorque

constantTorque2

Type: ConstantTorque